// Emacs style mode select	 -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// DESCRIPTION:
//		Gamma correction LUT.
//		Functions to draw patches (by post) directly to screen.
//		Functions to blit a block to the screen.
//
//-----------------------------------------------------------------------------


#ifndef __V_VIDEO__
#define __V_VIDEO__

#include "doomtype.h"

#include "doomdef.h"

// Needed because we are refering to patches.
#include "r_data.h"

//
// VIDEO
//

#define CENTERY					(SCREENHEIGHT/2)


// Screen 0 is the screen updated by I_Update screen.
// Screen 1 is an extra buffer.



extern	byte*			screens[5];

extern	int		dirtybox[4];

extern	byte	gammatable[5][256];
extern	int		usegamma;



// Allocates buffer screens, call before R_Init.
void V_Init (void);


void
V_CopyRect
( int			srcx,
  int			srcy,
  int			srcscrn,
  int			width,
  int			height,
  int			destx,
  int			desty,
  int			destscrn );

void
V_DrawPatch
( int			x,
  int			y,
  int			scrn,
  patch_t*		patch);

void
V_DrawPatchDirect
( int			x,
  int			y,
  int			scrn,
  patch_t*		patch );


// Draw a linear block of pixels into the view buffer.
void
V_DrawBlock
( int			x,
  int			y,
  int			scrn,
  int			width,
  int			height,
  byte*			src );

// Reads a linear block of pixels into the view buffer.
void
V_GetBlock
( int			x,
  int			y,
  int			scrn,
  int			width,
  int			height,
  byte*			dest );


void
V_MarkRect
( int			x,
  int			y,
  int			width,
  int			height );

#endif
//-----------------------------------------------------------------------------
//
// $Log:$
//
//-----------------------------------------------------------------------------
